just reading the original post again i see you have more than one battery ..
are they wired in a series or isolated from each other?
if they are wired together it may be smart to separate the batts. to keep the stereo from draining both ..you could add a voltage sensative relay (vsr)
for charging purposes or even just wire them to a dual battery switch to keep the "house" and "starting" batteries separate...or just run battery bank "1" one day out and battery bank "2" the next day out to keep them all lively...
sorry about the rambling..
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